PSD 960 grid with colunms

Hello. I am looking for a little help. I have recently downloaded the grid systems from here http://960.gs/ now when I open the PSD file the layer is locked, I unlock the layer and there is still a locked icon on the right of the layer. Difference is, that it is white instead of black. What can I do as I have read the guides on creating and uploading PSD files and all layers must be unlocked.